Use LocationIterator for scalability and instantiate MyTracksLocation to make sure that sensor data is properly read.

2010-12-28 16:19:34 -08:00
commit c328728e0c
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+/*
+ * Copyright 2010 Google Inc.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+package com.google.android.apps.mytracks;
+
+import com.google.android.accounts.Account;
+import com.google.android.accounts.AccountManager;
+import com.google.android.maps.mytracks.R;
+
+import android.app.Activity;
+import android.app.AlertDialog;
+import android.content.DialogInterface;
+import android.util.Log;
+
+/**
+ * Choose which account to upload track information to.
+ * @author Sandor Dornbush
+ */
+public class AccountChooser {
+ 
+  /**
+   * The last selected account.
+   */
+  private int selectedAccountIndex = -1;
+  private Account selectedAccount = null;
+
+  /**
+   * An interface for receiving updates once the user has selected the account.
+   */
+  public interface AccountHandler {
+    /**
+     * Handle the account being selected.
+     * @param account The selected account or null if none could be found
+     */
+    public void handleAccountSelected(Account account);
+  }
+
+  /**
+   * Chooses the best account to upload to.
+   * If no account is found the user will be alerted.
+   * If only one account is found that will be used.
+   * If multiple accounts are found the user will be allowed to choose.
+   * 
+   * @param activity The parent activity
+   * @param handler The handler to be notified when an account has been selected
+   */
+  public void chooseAccount(final Activity activity,
+      final AccountHandler handler) {
+    final Account[] accounts = AccountManager.get(activity)
+        .getAccountsByType(MyTracksConstants.ACCOUNT_TYPE);
+    if (accounts.length < 1) {
+      alertNoAccounts(activity, handler);
+      return;
+    }
+    if (accounts.length == 1) {
+      handler.handleAccountSelected(accounts[0]);
+      return;
+    }
+    
+    // TODO This should be read out of a preference.
+    if (selectedAccount != null) {
+      handler.handleAccountSelected(selectedAccount);
+      return;
+    }
+    
+    // Let the user choose.
+    Log.e(MyTracksConstants.TAG, "Multiple matching accounts found.");
+    final AlertDialog.Builder builder = new AlertDialog.Builder(activity);
+    builder.setTitle(R.string.choose_account_title);
+    builder.setCancelable(false);
+    builder.setPositiveButton(R.string.ok,
+        new DialogInterface.OnClickListener() {
+      public void onClick(DialogInterface dialog, int which) {
+        selectedAccount = accounts[selectedAccountIndex];
+        handler.handleAccountSelected(selectedAccount);
+      }
+    });
+    builder.setNegativeButton(R.string.cancel,
+        new DialogInterface.OnClickListener() {
+      public void onClick(DialogInterface dialog, int which) {
+        handler.handleAccountSelected(null);
+      }
+    });
+    String[] choices = new String[accounts.length];
+    for (int i = 0; i < accounts.length; i++) {
+      choices[i] = accounts[i].name;
+    }
+    builder.setSingleChoiceItems(choices, selectedAccountIndex,
+        new DialogInterface.OnClickListener() {
+      @Override
+      public void onClick(DialogInterface dialog, int which) {
+        selectedAccountIndex = which;
+      }
+    });
+    builder.show();
+  }
+
+  /**
+   * Puts up a dialog alerting the user that no suitable account was found.
+   */
+  private void alertNoAccounts(final Activity activity,
+      final AccountHandler handler) {
+    Log.e(MyTracksConstants.TAG, "No matching accounts found.");
+    final AlertDialog.Builder builder = new AlertDialog.Builder(activity);
+    builder.setTitle(R.string.no_account_found_title);
+    builder.setMessage(R.string.no_account_found);
+    builder.setCancelable(true);
+    builder.setNegativeButton(R.string.ok,
+        new DialogInterface.OnClickListener() {
+          public void onClick(DialogInterface dialog, int which) {
+            handler.handleAccountSelected(null);
+          }
+        });
+    builder.show();
+  }
+}